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Hi guys, some are probably familiar with this problem as I've noticed its a common occurrence through web search. Im looking at a 1998 e36 328i and its got yellowish gunk under the oil cap. Should I be concerned?

Sign of moisture most likely from condensation as per previous post of not being warmed up or as a result of short drives, check the plastic hose that connects to the valve cover right by the oil cap, most likely filled with same peanut butter looking gunk, and if not taken care of can cause issues

Sign of moisture most likely from condensation as per previous post of not being warmed up or as a result of short drives, check the plastic hose that connects to the valve cover right by the oil cap, most likely filled with same peanut butter looking gunk, and if not taken care of can cause issues

What tech 24 said needs to be driven longer run a flush and might as well change ccv valve and hoses and clean up the oil dipstick might start blocking up due to the sludge than thats were the damage happens ;-)

I see it on all models and years of bimmers daily. Usually due to short trips, moisture and unfrequent oil services. As mentioned a good flush is needed but also check your ccv pipe and I bet that system would need replacing as well.

Not a reason not to buy the car tbh, if true a large majority of bimmers would never be resold lol

It wouldn't stop me from buying it. My 330Ci did this a few times. My father's 330Ci did this a LOT more. He drove super-short distances and never drove it hard. I drove the snot out of mine. I used to take his car around the block while beating on it and it cleared it right up. If the car drives perfectly fine, I'd say it could even be a sign it was driven too gingerly and only over short distances.